4 ART. 20. — M. YOKOYAMA. 



latter there is a specimen of Pholadomya margaritacea. Wheth- 

 er another one of the same Pholadomya really comes from 

 Kawachidani, Echigo, is a question ; for it is doubtful whether 

 the label now attached to it really belongs to it or not. 



Recently a splendid specimen of Aturla ziczac was secured 

 by one of the geologists of the Imperial Geological Survey from 

 the coal-field of Takashima near Nagasaki, showing that the 

 coal-bearing series of that place is also probably Palœogene. 



DESCRIPTION OF THE SPECIES. 

 PLANTiî:. 



1. Cycas Fuj liana n. sp. 



PL I. Fig. 7. 



A fragment of a Cycadeous leaf showing a marked resem- 

 blance to Cycas revoluta L. now living in Japan and China. 



The segments are long, linear, parallel- sided, single-veined, 

 straight or slightly bent outward, directed somewhat forward, 

 distant and attached to the rachis with the whole base ap- 

 parently without any expansion or contraction ; the length may 

 have been more than 10 centim., as there are some measuring 

 8-9 centim. without the apical portion ; the breadth is 3-4.5 

 millim ; the distance between the two segments at their base is 

 about 3 millim. on an average. The rachis is comparatively 

 slender, measuring only 2-3 millim. and is furnished with 

 longitudinal striations on the surface. 



The distinction between the present species and the living 



